Painting: Filling, Stroking and Marker Symbols — SVG 2
For any value, all color syntaxes defined in CSS Color Module Level 3 must be supported, including rgb(), rgba(), hsl(), hsla(), the extended color keywords and the currentColor value.. The context-fill and context-stroke values are a reference to the paint layers generated for the fill or stroke property, respectively, of the context element of the element being painted.